Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9bd5e5cd9ca3cb7…

MALICIOUS

PDF

92.2 KB Created: 2021-07-19 09:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6e090ae81bbf098ad3e6ccff13fe6852 SHA-1: 9e625e95551411c935364113e40b72a1e59a2621 SHA-256: c9bd5e5cd9ca3cb7ec434811b6dc63d020f1d73c9b1c5b98fda607e2a3eb38d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://larrialdiak.es/files/galeria/files/65194117086.pdf In PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edbba34af0---81001060888.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/o9fcms3a8udu5soh37akl6pjtt/85456381080.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/82384597059.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/d3aa75c863f35d524bf39e2cc4a1e54d/12225263911.pdfIn PDF document text
    • http://mayfamilycircle.com/clients/5/53/53cd9f4101e72b768929e5daf979c2da/File/43048984118.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/53655247893.pdfIn PDF document text
    • http://cocoal.com/uploads/file/befise.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/viporivanexidaz.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/wusobaso.pdfIn PDF document text
    • http://chicohigh1987.com/clients/47015/File/lodademelivuvijewanefoti.pdfIn PDF document text
    • http://wsm.hk/images/files/10563728566.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/26796583401.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/24694844013.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbb0ac7975---wivaxokelovugonavij.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b1be8e82782---8177042050.pdfIn PDF document text
    • https://dhcom.vn/userfiles/file/gipefigofumazagarukowep.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffb450b79c---22247905573.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/41298072227.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/wuzaviperofuzefabi.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/e50feacfd25299ece46bdbb8be132cfb/gowuxefaxulevasu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+do+baby+blue+tailed+skinks+eatPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 16068 bytes
SHA-256: 6d636ebcb28a43c11a0b96216d988d0aaa25e428b847d4e039b2a2a6b6e27b6d
font_01_sfnt_off00010643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E5A 10684 bytes
SHA-256: 3e84d29c250f7998cb1b9e5101605fafac6fa03b767431ce16c5ba528de60869
font_03_sfnt_off000136c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C9 16404 bytes
SHA-256: 1e3cc52d1cf3079fca2abb543dd20ab4539e6adee01131d587f8d8d120478db5

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